|
- /* Copyright (c) 2016, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <string.h>
-
- #include <openssl/bytestring.h>
- #include <openssl/err.h>
- #include <openssl/hkdf.h>
- #include <openssl/mem.h>
- #include <openssl/stack.h>
- #include <openssl/x509.h>
-
- #include "../crypto/internal.h"
- #include "internal.h"
-
-
- /* kMaxKeyUpdates is the number of consecutive KeyUpdates that will be
- * processed. Without this limit an attacker could force unbounded processing
- * without being able to return application data. */
- static const uint8_t kMaxKeyUpdates = 32;
-
- int tls13_handshake(SSL_HANDSHAKE *hs, int *out_early_return) {
- SSL *const ssl = hs->ssl;
- for (;;) {
- /* Resolve the operation the handshake was waiting on. */
- switch (hs->wait) {
- case ssl_hs_error:
- OPENSSL_PUT_ERROR(SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
- return -1;
-
- case ssl_hs_flush:
- case ssl_hs_flush_and_read_message: {
- int ret = ssl->method->flush_flight(ssl);
- if (ret <= 0) {
- return ret;
- }
- if (hs->wait != ssl_hs_flush_and_read_message) {
- break;
- }
- ssl->method->expect_flight(ssl);
- hs->wait = ssl_hs_read_message;
- SSL_FALLTHROUGH;
- }
-
- case ssl_hs_read_message: {
- int ret = ssl->method->ssl_get_message(ssl);
- if (ret <= 0) {
- return ret;
- }
- break;
- }
-
- case ssl_hs_read_change_cipher_spec: {
- int ret = ssl->method->read_change_cipher_spec(ssl);
- if (ret <= 0) {
- return ret;
- }
- break;
- }
-
- case ssl_hs_read_end_of_early_data: {
- if (ssl->s3->hs->can_early_read) {
- /* While we are processing early data, the handshake returns early. */
- *out_early_return = 1;
- return 1;
- }
- hs->wait = ssl_hs_ok;
- break;
- }
-
- case ssl_hs_x509_lookup:
- ssl->rwstate = SSL_X509_LOOKUP;
- hs->wait = ssl_hs_ok;
- return -1;
-
- case ssl_hs_channel_id_lookup:
- ssl->rwstate = SSL_CHANNEL_ID_LOOKUP;
- hs->wait = ssl_hs_ok;
- return -1;
-
- case ssl_hs_private_key_operation:
- ssl->rwstate = SSL_PRIVATE_KEY_OPERATION;
- hs->wait = ssl_hs_ok;
- return -1;
-
- case ssl_hs_pending_ticket:
- ssl->rwstate = SSL_PENDING_TICKET;
- hs->wait = ssl_hs_ok;
- return -1;
-
- case ssl_hs_certificate_verify:
- ssl->rwstate = SSL_CERTIFICATE_VERIFY;
- hs->wait = ssl_hs_ok;
- return -1;
-
- case ssl_hs_early_data_rejected:
- ssl->rwstate = SSL_EARLY_DATA_REJECTED;
- /* Cause |SSL_write| to start failing immediately. */
- hs->can_early_write = 0;
- return -1;
-
- case ssl_hs_ok:
- break;
- }
-
- /* Run the state machine again. */
- hs->wait = hs->do_tls13_handshake(hs);
- if (hs->wait == ssl_hs_error) {
- /* Don't loop around to avoid a stray |SSL_R_SSL_HANDSHAKE_FAILURE| the
- * first time around. */
- return -1;
- }
- if (hs->wait == ssl_hs_ok) {
- /* The handshake has completed. */
- return 1;
- }
-
- /* Otherwise, loop to the beginning and resolve what was blocking the
- * handshake. */
- }
- }
-
- int tls13_get_cert_verify_signature_input(
- SSL_HANDSHAKE *hs, uint8_t **out, size_t *out_len,
- enum ssl_cert_verify_context_t cert_verify_context) {
- CBB cbb;
- if (!CBB_init(&cbb, 64 + 33 + 1 + 2 * EVP_MAX_MD_SIZE)) {
- goto err;
- }
-
- for (size_t i = 0; i < 64; i++) {
- if (!CBB_add_u8(&cbb, 0x20)) {
- goto err;
- }
- }
-
- const uint8_t *context;
- size_t context_len;
- if (cert_verify_context == ssl_cert_verify_server) {
- /* Include the NUL byte. */
- static const char kContext[] = "TLS 1.3, server CertificateVerify";
- context = (const uint8_t *)kContext;
- context_len = sizeof(kContext);
- } else if (cert_verify_context == ssl_cert_verify_client) {
- static const char kContext[] = "TLS 1.3, client CertificateVerify";
- context = (const uint8_t *)kContext;
- context_len = sizeof(kContext);
- } else if (cert_verify_context == ssl_cert_verify_channel_id) {
- static const char kContext[] = "TLS 1.3, Channel ID";
- context = (const uint8_t *)kContext;
- context_len = sizeof(kContext);
- } else {
- goto err;
- }
-
- if (!CBB_add_bytes(&cbb, context, context_len)) {
- goto err;
- }
-
- uint8_t context_hash[EVP_MAX_MD_SIZE];
- size_t context_hash_len;
- if (!SSL_TRANSCRIPT_get_hash(&hs->transcript, context_hash,
- &context_hash_len) ||
- !CBB_add_bytes(&cbb, context_hash, context_hash_len) ||
- !CBB_finish(&cbb, out, out_len)) {
- goto err;
- }
-
- return 1;
-
- err:
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- CBB_cleanup(&cbb);
- return 0;
- }
-
- int tls13_process_certificate(SSL_HANDSHAKE *hs, int allow_anonymous) {
- SSL *const ssl = hs->ssl;
- CBS cbs, context, certificate_list;
- CBS_init(&cbs, ssl->init_msg, ssl->init_num);
- if (!CBS_get_u8_length_prefixed(&cbs, &context) ||
- CBS_len(&context) != 0) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- return 0;
- }
-
- const int retain_sha256 =
- ssl->server && ssl->retain_only_sha256_of_client_certs;
- int ret = 0;
-
- EVP_PKEY *pkey = NULL;
- STACK_OF(CRYPTO_BUFFER) *certs = sk_CRYPTO_BUFFER_new_null();
- if (certs == NULL) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- if (!CBS_get_u24_length_prefixed(&cbs, &certificate_list)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- goto err;
- }
-
- while (CBS_len(&certificate_list) > 0) {
- CBS certificate, extensions;
- if (!CBS_get_u24_length_prefixed(&certificate_list, &certificate) ||
- !CBS_get_u16_length_prefixed(&certificate_list, &extensions) ||
- CBS_len(&certificate) == 0) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_CERT_LENGTH_MISMATCH);
- goto err;
- }
-
- if (sk_CRYPTO_BUFFER_num(certs) == 0) {
- pkey = ssl_cert_parse_pubkey(&certificate);
- if (pkey == NULL) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- goto err;
- }
- /* TLS 1.3 always uses certificate keys for signing thus the correct
- * keyUsage is enforced. */
- if (!ssl_cert_check_digital_signature_key_usage(&certificate)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
- goto err;
- }
-
- if (retain_sha256) {
- /* Retain the hash of the leaf certificate if requested. */
- SHA256(CBS_data(&certificate), CBS_len(&certificate),
- hs->new_session->peer_sha256);
- }
- }
-
- CRYPTO_BUFFER *buf =
- CRYPTO_BUFFER_new_from_CBS(&certificate, ssl->ctx->pool);
- if (buf == NULL ||
- !sk_CRYPTO_BUFFER_push(certs, buf)) {
- CRYPTO_BUFFER_free(buf);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- goto err;
- }
-
- /* Parse out the extensions. */
- int have_status_request = 0, have_sct = 0;
- CBS status_request, sct;
- const SSL_EXTENSION_TYPE ext_types[] = {
- {TLSEXT_TYPE_status_request, &have_status_request, &status_request},
- {TLSEXT_TYPE_certificate_timestamp, &have_sct, &sct},
- };
-
- uint8_t alert = SSL_AD_DECODE_ERROR;
- if (!ssl_parse_extensions(&extensions, &alert, ext_types,
- OPENSSL_ARRAY_SIZE(ext_types),
- 0 /* reject unknown */)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
- goto err;
- }
-
- /* All Certificate extensions are parsed, but only the leaf extensions are
- * stored. */
- if (have_status_request) {
- if (ssl->server || !ssl->ocsp_stapling_enabled) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
- goto err;
- }
-
- uint8_t status_type;
- CBS ocsp_response;
- if (!CBS_get_u8(&status_request, &status_type) ||
- status_type != TLSEXT_STATUSTYPE_ocsp ||
- !CBS_get_u24_length_prefixed(&status_request, &ocsp_response) ||
- CBS_len(&ocsp_response) == 0 ||
- CBS_len(&status_request) != 0) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- goto err;
- }
-
- if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
- !CBS_stow(&ocsp_response, &hs->new_session->ocsp_response,
- &hs->new_session->ocsp_response_length)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- goto err;
- }
- }
-
- if (have_sct) {
- if (ssl->server || !ssl->signed_cert_timestamps_enabled) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_EXTENSION);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNSUPPORTED_EXTENSION);
- goto err;
- }
-
- if (!ssl_is_sct_list_valid(&sct)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_ERROR_PARSING_EXTENSION);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- goto err;
- }
-
- if (sk_CRYPTO_BUFFER_num(certs) == 1 &&
- !CBS_stow(
- &sct, &hs->new_session->tlsext_signed_cert_timestamp_list,
- &hs->new_session->tlsext_signed_cert_timestamp_list_length)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- goto err;
- }
- }
- }
-
- if (CBS_len(&cbs) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- goto err;
- }
-
- EVP_PKEY_free(hs->peer_pubkey);
- hs->peer_pubkey = pkey;
- pkey = NULL;
-
- sk_CRYPTO_BUFFER_pop_free(hs->new_session->certs, CRYPTO_BUFFER_free);
- hs->new_session->certs = certs;
- certs = NULL;
-
- if (!ssl->ctx->x509_method->session_cache_objects(hs->new_session)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- goto err;
- }
-
- if (sk_CRYPTO_BUFFER_num(hs->new_session->certs) == 0) {
- if (!allow_anonymous) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_CERTIFICATE_REQUIRED);
- goto err;
- }
-
- /* OpenSSL returns X509_V_OK when no certificates are requested. This is
- * classed by them as a bug, but it's assumed by at least NGINX. */
- hs->new_session->verify_result = X509_V_OK;
-
- /* No certificate, so nothing more to do. */
- ret = 1;
- goto err;
- }
-
- hs->new_session->peer_sha256_valid = retain_sha256;
- ret = 1;
-
- err:
- sk_CRYPTO_BUFFER_pop_free(certs, CRYPTO_BUFFER_free);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- int tls13_process_certificate_verify(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- if (hs->peer_pubkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- CBS cbs, signature;
- uint16_t signature_algorithm;
- CBS_init(&cbs, ssl->init_msg, ssl->init_num);
- if (!CBS_get_u16(&cbs, &signature_algorithm) ||
- !CBS_get_u16_length_prefixed(&cbs, &signature) ||
- CBS_len(&cbs) != 0) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return 0;
- }
-
- uint8_t alert = SSL_AD_DECODE_ERROR;
- if (!tls12_check_peer_sigalg(ssl, &alert, signature_algorithm)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
- return 0;
- }
- hs->new_session->peer_signature_algorithm = signature_algorithm;
-
- uint8_t *msg = NULL;
- size_t msg_len;
- if (!tls13_get_cert_verify_signature_input(
- hs, &msg, &msg_len,
- ssl->server ? ssl_cert_verify_client : ssl_cert_verify_server)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return 0;
- }
- bssl::UniquePtr<uint8_t> free_msg(msg);
-
- int sig_ok =
- ssl_public_key_verify(ssl, CBS_data(&signature), CBS_len(&signature),
- signature_algorithm, hs->peer_pubkey, msg, msg_len);
- #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
- sig_ok = 1;
- ERR_clear_error();
- #endif
- if (!sig_ok) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_SIGNATURE);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
- return 0;
- }
-
- return 1;
- }
-
- int tls13_process_finished(SSL_HANDSHAKE *hs, int use_saved_value) {
- SSL *const ssl = hs->ssl;
- uint8_t verify_data_buf[EVP_MAX_MD_SIZE];
- const uint8_t *verify_data;
- size_t verify_data_len;
- if (use_saved_value) {
- assert(ssl->server);
- verify_data = hs->expected_client_finished;
- verify_data_len = hs->hash_len;
- } else {
- if (!tls13_finished_mac(hs, verify_data_buf, &verify_data_len,
- !ssl->server)) {
- return 0;
- }
- verify_data = verify_data_buf;
- }
-
- int finished_ok =
- ssl->init_num == verify_data_len &&
- CRYPTO_memcmp(verify_data, ssl->init_msg, verify_data_len) == 0;
- #if defined(BORINGSSL_UNSAFE_FUZZER_MODE)
- finished_ok = 1;
- #endif
- if (!finished_ok) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECRYPT_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
- return 0;
- }
-
- return 1;
- }
-
- int tls13_add_certificate(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- bssl::ScopedCBB cbb;
- CBB body, certificate_list;
- if (!ssl->method->init_message(ssl, cbb.get(), &body, SSL3_MT_CERTIFICATE) ||
- /* The request context is always empty in the handshake. */
- !CBB_add_u8(&body, 0) ||
- !CBB_add_u24_length_prefixed(&body, &certificate_list)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- if (!ssl_has_certificate(ssl)) {
- return ssl_add_message_cbb(ssl, cbb.get());
- }
-
- CERT *cert = ssl->cert;
- CRYPTO_BUFFER *leaf_buf = sk_CRYPTO_BUFFER_value(cert->chain, 0);
- CBB leaf, extensions;
- if (!CBB_add_u24_length_prefixed(&certificate_list, &leaf) ||
- !CBB_add_bytes(&leaf, CRYPTO_BUFFER_data(leaf_buf),
- CRYPTO_BUFFER_len(leaf_buf)) ||
- !CBB_add_u16_length_prefixed(&certificate_list, &extensions)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
-
- if (hs->scts_requested && ssl->cert->signed_cert_timestamp_list != NULL) {
- CBB contents;
- if (!CBB_add_u16(&extensions, TLSEXT_TYPE_certificate_timestamp) ||
- !CBB_add_u16_length_prefixed(&extensions, &contents) ||
- !CBB_add_bytes(
- &contents,
- CRYPTO_BUFFER_data(ssl->cert->signed_cert_timestamp_list),
- CRYPTO_BUFFER_len(ssl->cert->signed_cert_timestamp_list)) ||
- !CBB_flush(&extensions)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
-
- if (hs->ocsp_stapling_requested &&
- ssl->cert->ocsp_response != NULL) {
- CBB contents, ocsp_response;
- if (!CBB_add_u16(&extensions, TLSEXT_TYPE_status_request) ||
- !CBB_add_u16_length_prefixed(&extensions, &contents) ||
- !CBB_add_u8(&contents, TLSEXT_STATUSTYPE_ocsp) ||
- !CBB_add_u24_length_prefixed(&contents, &ocsp_response) ||
- !CBB_add_bytes(&ocsp_response,
- CRYPTO_BUFFER_data(ssl->cert->ocsp_response),
- CRYPTO_BUFFER_len(ssl->cert->ocsp_response)) ||
- !CBB_flush(&extensions)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
-
- for (size_t i = 1; i < sk_CRYPTO_BUFFER_num(cert->chain); i++) {
- CRYPTO_BUFFER *cert_buf = sk_CRYPTO_BUFFER_value(cert->chain, i);
- CBB child;
- if (!CBB_add_u24_length_prefixed(&certificate_list, &child) ||
- !CBB_add_bytes(&child, CRYPTO_BUFFER_data(cert_buf),
- CRYPTO_BUFFER_len(cert_buf)) ||
- !CBB_add_u16(&certificate_list, 0 /* no extensions */)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return 0;
- }
- }
-
- return ssl_add_message_cbb(ssl, cbb.get());
- }
-
- enum ssl_private_key_result_t tls13_add_certificate_verify(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- uint16_t signature_algorithm;
- if (!tls1_choose_signature_algorithm(hs, &signature_algorithm)) {
- return ssl_private_key_failure;
- }
-
- bssl::ScopedCBB cbb;
- CBB body;
- if (!ssl->method->init_message(ssl, cbb.get(), &body,
- SSL3_MT_CERTIFICATE_VERIFY) ||
- !CBB_add_u16(&body, signature_algorithm)) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return ssl_private_key_failure;
- }
-
- /* Sign the digest. */
- CBB child;
- const size_t max_sig_len = EVP_PKEY_size(hs->local_pubkey);
- uint8_t *sig;
- size_t sig_len;
- if (!CBB_add_u16_length_prefixed(&body, &child) ||
- !CBB_reserve(&child, &sig, max_sig_len)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_private_key_failure;
- }
-
- uint8_t *msg = NULL;
- size_t msg_len;
- if (!tls13_get_cert_verify_signature_input(
- hs, &msg, &msg_len,
- ssl->server ? ssl_cert_verify_server : ssl_cert_verify_client)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- return ssl_private_key_failure;
- }
- bssl::UniquePtr<uint8_t> free_msg(msg);
-
- enum ssl_private_key_result_t sign_result = ssl_private_key_sign(
- hs, sig, &sig_len, max_sig_len, signature_algorithm, msg, msg_len);
- if (sign_result != ssl_private_key_success) {
- return sign_result;
- }
-
- if (!CBB_did_write(&child, sig_len) ||
- !ssl_add_message_cbb(ssl, cbb.get())) {
- return ssl_private_key_failure;
- }
-
- return ssl_private_key_success;
- }
-
- int tls13_add_finished(SSL_HANDSHAKE *hs) {
- SSL *const ssl = hs->ssl;
- size_t verify_data_len;
- uint8_t verify_data[EVP_MAX_MD_SIZE];
-
- if (!tls13_finished_mac(hs, verify_data, &verify_data_len, ssl->server)) {
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
- OPENSSL_PUT_ERROR(SSL, SSL_R_DIGEST_CHECK_FAILED);
- return 0;
- }
-
- CBB cbb, body;
- if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_FINISHED) ||
- !CBB_add_bytes(&body, verify_data, verify_data_len) ||
- !ssl_add_message_cbb(ssl, &cbb)) {
- CBB_cleanup(&cbb);
- return 0;
- }
-
- return 1;
- }
-
- static int tls13_receive_key_update(SSL *ssl) {
- CBS cbs;
- uint8_t key_update_request;
- CBS_init(&cbs, ssl->init_msg, ssl->init_num);
- if (!CBS_get_u8(&cbs, &key_update_request) ||
- CBS_len(&cbs) != 0 ||
- (key_update_request != SSL_KEY_UPDATE_NOT_REQUESTED &&
- key_update_request != SSL_KEY_UPDATE_REQUESTED)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_DECODE_ERROR);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
- return 0;
- }
-
- if (!tls13_rotate_traffic_key(ssl, evp_aead_open)) {
- return 0;
- }
-
- /* Acknowledge the KeyUpdate */
- if (key_update_request == SSL_KEY_UPDATE_REQUESTED &&
- !ssl->s3->key_update_pending) {
- CBB cbb, body;
- if (!ssl->method->init_message(ssl, &cbb, &body, SSL3_MT_KEY_UPDATE) ||
- !CBB_add_u8(&body, SSL_KEY_UPDATE_NOT_REQUESTED) ||
- !ssl_add_message_cbb(ssl, &cbb) ||
- !tls13_rotate_traffic_key(ssl, evp_aead_seal)) {
- CBB_cleanup(&cbb);
- return 0;
- }
-
- /* Suppress KeyUpdate acknowledgments until this change is written to the
- * wire. This prevents us from accumulating write obligations when read and
- * write progress at different rates. See draft-ietf-tls-tls13-18, section
- * 4.5.3. */
- ssl->s3->key_update_pending = 1;
- }
-
- return 1;
- }
-
- int tls13_post_handshake(SSL *ssl) {
- if (ssl->s3->tmp.message_type == SSL3_MT_KEY_UPDATE) {
- ssl->s3->key_update_count++;
- if (ssl->s3->key_update_count > kMaxKeyUpdates) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_TOO_MANY_KEY_UPDATES);
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- return 0;
- }
-
- return tls13_receive_key_update(ssl);
- }
-
- ssl->s3->key_update_count = 0;
-
- if (ssl->s3->tmp.message_type == SSL3_MT_NEW_SESSION_TICKET &&
- !ssl->server) {
- return tls13_process_new_session_ticket(ssl);
- }
-
- ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNEXPECTED_MESSAGE);
- return 0;
- }
|